Protective device for sheathed conductors.



T. E. MURRM. PROTEGHV. DEVICE POB, SHEATH'ED GONDUGTORS. .APPLICATIONFILED APR. 15, 1912..

objects.

FICE.

THOMAS E. MURRAY,

or nnvv YORK, iv. Y.

13ROTIICTIVE DEVICE FOR SHEATHED CONDUCTORS.

Bc it known that I, THOMAS MURRAY, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented a certain new and useful Improvement in Protective Devicesfor Sheathed Conductors, of which the following is a specification.

The object of the invention is to prevent conduction of stray currentsby the metal sheathing of electrical conductors, and thus to prevent theinjurious electrolytic and other edects of said currents upon adjacentTo this end, I remove a portion of the sheathing over a 4given length oithe continuous conductor, thus forming a gap over which the currentcannot pass. In a long conductor, as many of these gsps ina Y be made asis necessary to the end in view. The gap is coveredv with a protectivesleeve of insulating material, secured to the conductor and suitablypacked, as .liereinaiter explained.

In the accompanying, drawings- Figure l is a longitudinal section of mydevice, Iiigx 2 is a cross section on the line 2, 2 of Eig. l, Fig. 3 isa longitudinal section of?? a. modified form of my device, and Fig, e isa, cross seetion on the line d, 4; et Fig. 3.

Similar letters of reference indicate like parts. Y i

A represents a line oondnetor, havnig; the usual Wire B, insulating;envelop C and lead sheathing D. In order to prevent conduction ot straycurrents by the sheathing I), I remove a portion thereof, shown F is asleeve of preferably porcoiain' other refractory insulating material,shown as a complete tube in Figs. 3 and i., and as formed in two halfsections G, El, in litige. 1 and 2, and provided with enlarged at itsends to receive packing I, The middle portion of the sleeve,wliielidireetly loses the denuded portion E of the conduction receives afilling d' of insulating material, introduced in tiuid state, tlnoi i ejs in the sleeve, which are clos c.. plugs K: said iilling afterwarinplace. The half sections 1 n together by the half bands ,l havingmeeting flanges to receive bea. ed s .fs The openings in the sleeve foradmi insulating Filling J extend through the ripper halt band L, and arealso closed by tire tapered plugs K. In assembling tbe de vice, the haltsections G, I-I are placed upon Specification of Letters Patent.

Application led April l5, 1912.

Ilatented July 21, i914.

serial no. 690,973.

the conductor and secured by the halic bands L, M. The plugs II beingremoved, the insulating iilling J is introduced, andthe plugs replaced.The packing I is then put. in

place: or, if desired, the packing may be inserted before the filling isput in.

The forni of my device shown in Figs. l and 2 is suited to conditionswhere it is not desirable to break 'the continuity of the wire B, orWhere the ends of the line conductor cannot be reached. In the toi-1nshown in Figs. 3 and 4, in which the sleeve F is a'complete tube, thehalf bands are, of course, omitted, and the sleeve after being,` passedover an end of the conductor, is slid along into proper position, afterwhich the filling J is introduced, as before.

1ifihile I may use any suitable packing I at the ends of the sleeve, Iprefer to form upon the lead sheath annular flanges, by inserting in theenlargements nt' the sheath ends, a body of lead floss and consolidatingthe same, and also causing the same to cohere and become integral withsaid lead sheath, as fully set ont in my 'application for liet-terslfatent, Serial No. 661,32?, tiled November 20, 191i. After theseflanges are made, they not only form moistureprooi joints'betiveei-ishea thing and sleeve, but also prevent any sliding ofc' the sleeve onthe conductor. Sliding' is also measurably prevented by the lilling ,ladhering to theinsulatini; envelop C.

lVbile l have here described the lead sheathing only as removed over thelength at E. thus exposing the insulating covering;

(f, it is obvious that, it desired, snidcovering' C also may removed,'the naked Wire i3 tben being embedded in the iilling I claim:

l, lin combination, a line conductor cov ered with an insulation, ametal sheath cov and a. 'liing of insulating material between saiddenuded portion of said conductor and said sleeve: the said sleeve andsind band having registering openings for introducing said filling in a,Huid state, and means for 15 closing said openings.

11 testimony 'whereof I have :liixed my signature in presence of twoWitnesses.

THOMAS E.MURRAY. llitnesses l?. W. Jessen, R. W. LAIDLOW.

